Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e56b0376e15a2e…

MALICIOUS

PDF

118.4 KB Created: 2021-05-29 04:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: aa276b1cfabd8aba756926c3f1366afa SHA-1: 5a88ab85129281833728d2e3fae10bd627a067f0 SHA-256: 80e56b0376e15a2ef4c34800608bf99ef0e5568887efe07c4dc2f0d35a96a28a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/123?utm_term=sonic+all-+stars+racing+transformed+collection+gameplay PDF link annotation
    • https://jarupaxalimex.weebly.com/uploads/1/3/5/3/135324443/paxubaboputoruwek.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/betiseseku.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/kijorita-mumoxifavore-rolokapizezida-dogadodiw.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/cc79346063343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_6033e46184649.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/nemus-luwopuvobobuzu-soxokalegaveme.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/kireratojepomofixav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_603ee7773b20c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_601ee5fd9e6e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe1d07fc4fca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5ffed05d03211.pdfIn PDF document text
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/rijedinituvubaseg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fcbfaf435be6.pdfIn PDF document text
    • https://juzofejojakowam.weebly.com/uploads/1/3/4/1/134131318/fenesuwoxukadi-zavuve-mowijezake-gotaguzepizurog.pdfIn PDF document text
    • https://zuzowasef.weebly.com/uploads/1/3/4/3/134351381/846de4.pdfIn PDF document text
    • https://xugasejesakegeg.weebly.com/uploads/1/3/4/6/134617370/rikalemepoxelu_xitob_luzizonopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_603b42db92a4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 21048 bytes
SHA-256: 049c3a2c55b9e340e7106c7ffcd4ee1478d26ee3239a75e28ca68a7783ec7b9d
font_01_sfnt_off00017d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4B 5500 bytes
SHA-256: 0f3a195e3335b2eb0c5a65823f7ca35bb5057d341f6b7d7516b34907e92616ad
font_02_sfnt_off00018fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE3 13584 bytes
SHA-256: 1dc30f20d7016d6ce09f75f9153b83593a7ade466301a937d6a94c8bcd0fde67
font_03_sfnt_off0001bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB79 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3